Dynamic speckle generation tuned by thermo-optic effects

IF 3.5 2区工程技术 Q2 OPTICS

Optics and Lasers in Engineering Pub Date : 2025-06-24 DOI:10.1016/j.optlaseng.2025.109176

Vicente Reyes-Alejo, Jose R. Guzman-Sepulveda

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引用次数: 0

Abstract

We present a strategy for the generation of dynamic, random speckles, whose characteristic fluctuation time can be adjusted controllably by tuning the volume scattering properties of a complex medium by means of its geometrical size and thermo-optic effects. We engineered a thermo-optical colloidal suspension, around the condition of refractive index matching between the particles and the suspending medium, that allows experiencing different regimes of volume scattering (null, single, multiple) controllably as temperature is varied. We characterized the temporal fluctuations of dynamic speckles in a dedicated optical fiber-based setup, in transmission, where we placed the thermo-optic colloidal suspension between the facets of two collinear optical fibers; a multimode fiber sets the input, static speckle, and the output, dynamic speckle is collected with a single-mode fiber for its characterization. The characteristic fluctuation time was successfully tuned by one order of magnitude, in the range

10 ms \leq τ \leq 100 ms

. Because dynamic speckles are generated through the light scattering of Brownian particles, realizations are ensured to be random, statistically independent regardless of the fluctuation rate.

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由热光学效应调谐的动态散斑生成

我们提出了一种动态随机散斑的生成策略，其特征波动时间可以通过调节复杂介质的几何尺寸和热光学效应的体积散射特性来控制。我们设计了一种热光学胶体悬浮液，围绕颗粒和悬浮介质之间的折射率匹配的条件，允许随着温度的变化而可控地经历不同的体积散射（零、单、多）。我们在一个专用的基于光纤的装置中表征了动态散斑的时间波动，在传输中，我们将热光学胶体悬浮液放在两根共线光纤的面之间；多模光纤设置输入，静态散斑，输出，动态散斑是用单模光纤收集其表征。在10ms≤τ≤100ms的范围内，成功地将特征波动时间调谐了一个数量级。由于动态斑点是通过布朗粒子的光散射产生的，因此无论涨落率如何，实现都保证是随机的、统计独立的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics and Lasers in Engineering 工程技术-光学

CiteScore

8.90

自引率

8.70%

发文量

384

审稿时长

42 days

期刊介绍： Optics and Lasers in Engineering aims at providing an international forum for the interchange of information on the development of optical techniques and laser technology in engineering. Emphasis is placed on contributions targeted at the practical use of methods and devices, the development and enhancement of solutions and new theoretical concepts for experimental methods. Optics and Lasers in Engineering reflects the main areas in which optical methods are being used and developed for an engineering environment. Manuscripts should offer clear evidence of novelty and significance. Papers focusing on parameter optimization or computational issues are not suitable. Similarly, papers focussed on an application rather than the optical method fall outside the journal''s scope. The scope of the journal is defined to include the following: -Optical Metrology- Optical Methods for 3D visualization and virtual engineering- Optical Techniques for Microsystems- Imaging, Microscopy and Adaptive Optics- Computational Imaging- Laser methods in manufacturing- Integrated optical and photonic sensors- Optics and Photonics in Life Science- Hyperspectral and spectroscopic methods- Infrared and Terahertz techniques